Body of microscope Item Basic Value objective(I) F=230 objective(II) F=280 Indication value on magnification (X) 2.5 1.5 1 0.66 0.4 2.5 1.5 1 0.66 0.4 Total magnification(X) 21.7 13.2 8.7 5.7 3.5 17.8 10.8 7.1 4.7 2.9 Linear field(mm) 11.5 18.4 27.6 42.3 69.2 13.4 22.2 33.6 51.1 84.4 Resolution(LP/mm) 85 68 53 35 28 80 63 42 31 22.4 Focal length of objective F= 230mm, F= 280mm Eyepiece magnification 16x Exit pupil diameter 1.3mm/11.3mm Magnification changer 5-stage 0.4x 0.66x 1x 1.5x 2.5x Total magnification 2.9x ~ 21.7x Linear field 11~84mm Working distance 215mm , 260mm Tilted angle 0°, 45° Interpupillary distance 55-75mm Diopter ±5 Fine focusing ±9mm